CVE-2026-77203
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk23th percentile - higher than 23% of all known CVEs
Summary
The Groups – Memberships and Access Control plugin for WordPress in versions up to and including 4.6.0 is vulnerable to privilege escalation. The groups_join() function derives group-join eligibility from the ambient post's author capabilities via the global $post->post_author rather than the authenticated user's own capabilities, while also minting a valid groups-join-data hash and nonce. An authenticated attacker with Subscriber-level access can enroll into any group, including privileged ones, and ultimately escalate to Administrator.
Risk Assessment
Any logged-in user, even with low privileges, can gain full administrative control over the WordPress site. The risk is critical as it leads to complete site takeover.
Recommendation
Update the plugin to a version later than 4.6.0 as soon as it is available, or temporarily disable it. Check for unauthorized administrator accounts and review group memberships.
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Original NVD description (English source)
The Groups – Memberships and Access Control plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 4.6.0. This is due to the groups_join() function deriving group-join eligibility from the ambient post's author capabilities via the global $post->post_author rather than from the currently authenticated user's own capabilities, while simultaneously minting and returning a valid groups-join-data hash and WordPress nonce for the caller in the same response — eliminating all authorization barriers to self-enrollment. This makes it possible for authenticated attackers, with Subscriber-level access and above, to enroll themselves into any group including privileged groups carrying the groups_admin_groups capability, and to subsequently create and join a group containing every registered WordPress capability, effectively escalating their privileges to Administrator. Exploitation requires the attacker to supply an Administrator-authored post ID via the post_ID parameter of the authenticated wp_ajax_parse_media_shortcode handler in order to establish the privileged ambient post context used by the flawed authorization check.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS